A drum dust collector for determining adhesion index

Abstract

This utility model belongs to the technical field of rotary drum equipment, and relates to a dust removal device for a rotary drum used for determining the adhesion index. It includes a housing, inside which a rotary drum disc is disposed. A rotary drum shaft is disposed at the bottom of the rotary drum disc. A ring-shaped metal filter screen is coaxially sleeved on the outer side of the rotary drum disc. The metal filter screen is fixed to the end face of the rotary drum by a detachable snap-fit ​​structure. The metal filter screen is a 304 stainless steel stamped round-hole filter screen with a hole diameter of 0.5-1mm and an opening rate ≥60%. A dust removal chamber of 5-10mm is formed between the metal filter screen and the outer wall of the rotary drum disc. This utility model is simple and convenient to operate, significantly reduces dust during the operation of the adhesion index rotary drum, reduces the workload of cleaning personnel, and effectively improves the operating environment.

Description

Technical Field

[0001] This utility model belongs to the technical field of rotary drum equipment, specifically relating to a dust removal device for measuring the adhesion index of a rotary drum. Background Technology

[0002] The caking index (G-value) of bituminous coal is an important indicator for evaluating the coking performance of coking coal. According to the national standard GB / T 5447-2014 "Method for Determination of Caking Index of Bituminous Coal", the mechanical strength of the coke residue needs to be tested through a rotary drum test. In the standard test procedure, the coke residue is placed inside a rotary drum disc and rotated 500 times at a speed of 50±2 rpm driven by the drum shaft. Due to friction and collision, a large amount of micron-sized coal powder is generated from the coke residue.

[0003] Traditional rotary drums use an open structure, during which coal dust escapes and accumulates on the inner wall of the equipment shell. When the drum stops and the cover is opened, the accumulated dust is disturbed by the airflow and forms an aerosol. The PM2.5 concentration at the work site momentarily exceeds the limit. The escaped dust adheres to the inner wall of the drum and forms a buffer layer, which weakens the collision energy between the coke residue and the drum, resulting in a systematically high adhesion index measurement value.

[0004] The common solution in existing technologies is to install a bag filter on the outside of the drum, but this results in excessive airflow resistance affecting the stability of the drum's rotation speed, and the filter bags are easily clogged by coal dust. There is an urgent need to develop a drum dust collector with strong dynamic sealing, efficient online cleaning, and without interfering with testing accuracy. Therefore, a drum dust collector for determining the adhesion index is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a dust removal device for a drum used for measuring the adhesion index, which has the function of dust removal for measuring the adhesion index and solves the problems in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a dust removal device for determining the adhesion index using a rotary drum, including a housing, a rotary drum disc inside the housing, a rotary drum shaft at the bottom of the rotary drum disc, and an annular metal filter screen coaxially sleeved on the outer side of the rotary drum disc. The metal filter screen is fixed to the end face of the rotary drum by a detachable snap-fit ​​structure. The metal filter screen is a 304 stainless steel stamped round hole filter screen with a hole diameter of 0.5-1mm and an opening rate of ≥60%. A dust removal chamber of 5-10mm is formed between the metal filter screen and the outer wall of the rotary drum disc.

[0007] Preferably, the detachable buckle structure includes an annular groove and an elastic strip. The annular groove is located on the end face of the rotating drum, and the elastic strip is located on the edge of the metal filter screen. The elastic strip is L-shaped and has an interference fit with the annular groove.

[0008] Preferably, the drum disc is a stainless steel cylinder, and a drum shaft connected to a drive device is provided at the center of the bottom of the drum disc.

[0009] As a preferred embodiment, it also includes an annular dust collection pipe, which is embedded on the outside of the rotating drum disc and located below the dust removal chamber. A suction pipe is provided on the annular dust collection pipe, and a pipe cover is provided on the suction pipe.

[0010] Preferably, the annular dust collection port opened on the inner side of the annular dust collection pipe has an axis that forms a 30° angle with the center line of the dust removal chamber.

[0011] Preferably, a high-frequency vibrator is also included, which is installed on the side wall of the drum shaft and contacts the bottom of the metal filter screen through a transmission rod.

[0012] Preferably, the driving device for the rotating drum is a variable frequency motor, and a fixed bracket is provided at the bottom of the variable frequency motor.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0014] 1. This utility model is simple and easy to operate, and has a significant effect on reducing dust in the operation of the viscous index drum, reducing the workload of cleaning personnel and effectively improving the operating environment;

[0015] 2. This utility model has a dust removal function for the drum used for determining the adhesion index, with strong dynamic sealing, efficient online dust removal, and no interference with the test accuracy. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a partial structural schematic diagram of a rotary drum dust collector for determining adhesion index according to one embodiment.

[0018] Figure 2 This is a partial structural schematic diagram of a rotary drum dust collector for determining adhesion index according to one embodiment.

[0019] In the above diagram, 1. Rotary drum disc, 2. Rotary drum shaft, 3. Metal filter screen, 4. Annular groove, 5. Elastic retaining strip, 6. Annular dust collection pipe, 7. Dust suction pipe, 8. Pipe cover, 9. High-frequency vibrator, 10. Conducting rod. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0022] Example 1, such as Figure 1-2 As shown, a dust removal device for determining adhesion index includes a housing, inside which a rotating drum 1 is installed. The rotating drum 1 is the main body for testing the mechanical strength of coke residue. By rotating, the coke residue is made to collide and rub against each other. A rotating drum shaft 2 is installed at the bottom of the rotating drum 1. An annular metal filter screen 3 is coaxially sleeved on the outside of the rotating drum 1. The metal filter screen 3 intercepts large particles of debris, forming a dynamic filtration barrier.

[0023] The metal filter screen 3 is fixed to the end face of the drum by a detachable snap-fit ​​structure. The detachable snap-fit ​​structure enables the quick installation and removal of the metal filter screen 3, maintaining dynamic sealing. The metal filter screen 3 is a 304 stainless steel stamped round hole filter screen with a hole diameter of 0.5-1mm and an opening rate of ≥60%. After fluid dynamics optimization, the opening rate is optimized to 62%±2%. A dust removal chamber of 5-10mm is formed between the metal filter screen 3 and the outer wall of the drum disc 1, which serves as a temporary storage space for dust and a buffer space for airflow.

[0024] The specific design of the aforementioned key components will be discussed in detail below:

[0025] The detachable snap-fit ​​structure includes an annular groove 4 and an elastic clip 5. The annular groove 4 is located on the end face of the rotating drum disc 1, and the elastic clip 5 is located on the edge of the metal filter screen 3. The elastic clip 5 is L-shaped and interference-fits the annular groove 4. The elastic clip 5 is made of 60Si2Mn spring steel, with a springback angle of 45° and a compression deformation of 0.8mm. The annular groove 4 has a groove depth of 5mm and a groove wall inclination angle of 3°, forming a self-locking structure. A silicone sealing strip is embedded at the bottom of the annular groove 4 to increase friction.

[0026] The rotating drum disc 1 is a stainless steel cylinder. The rotating drum disc 1 carries coke residue and transmits rotational mechanical energy. The cylinder wall thickness gradient is 1.2mm at the top to reduce weight and 2.0mm at the bottom to resist wear. The rotating drum shaft 2 is set at the center of the bottom of the rotating drum disc 1 to connect the drive device.

[0027] It also includes an annular dust collection pipe 6, which is embedded on the outside of the rotating drum disc 1 and located below the dust removal chamber. A suction pipe 7 is installed on the annular dust collection pipe 6, and a pipe cover 8 is installed on the suction pipe 7. The pipe cover 8 seals the suction pipe 7 when an external induced draft fan is not needed. An annular slit dust collection port is opened on the inner side of the annular dust collection pipe 6, utilizing the Coanda effect to adsorb boundary layer dust. The axis of the annular slit dust collection port forms a 30° angle with the center line of the dust removal chamber. This 30° angled slope guides the flow and uses centrifugal force to accelerate dust settling. The centrifugal force of the rotating drum throws the dust towards the outer wall of the dust removal chamber. The dust settles into the annular dust collection pipe 6 due to gravity. When cleaning is required, the machine is stopped, and the suction pipe 7 is connected to the induced draft fan to generate negative pressure at the annular slit dust collection port, cleaning the dust inside the annular dust collection pipe 6.

[0028] It also includes a high-frequency vibrator 9, which is installed on the side wall of the drum shaft 2. The high-frequency vibrator 9 contacts the bottom of the metal filter screen 3 through the transmission rod 10. The high-frequency vibrator 9 removes dust clogging the filter screen online. It is directly installed on the side wall of the drum shaft 2, and has high vibration transmission efficiency. The transmission rod 10 has a titanium alloy body and a red copper contact. The contact curvature R = 5mm, the working frequency avoids the natural frequency of the drum, the shaft system installation avoids resonance, the red copper contact adapts to the deformation of the filter screen, and the contact pressure is stable.

[0029] The drive device for the rotating drum 1 is a variable frequency motor, with a fixed support at its bottom. The variable frequency motor provides precise speed control, employs a three-point suspension support with a fixed support, and features a nitrile rubber shock-absorbing layer. A photoelectric encoder is mounted on the variable frequency motor, and a PID algorithm is used to compensate for torque fluctuations caused by the dust removal system in real time.

[0030] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0031] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A rotary drum dust collector for determining adhesion index, comprising a housing, a rotary drum disc disposed inside the housing, and a rotary drum shaft disposed at the bottom of the rotary drum disc, characterized in that, A ring-shaped metal filter screen is coaxially sleeved on the outer side of the rotating drum. The metal filter screen is fixed to the end face of the rotating drum by a detachable buckle structure. The metal filter screen is a 304 stainless steel stamped round hole filter screen with a hole diameter of 0.5-1mm and an opening rate of ≥60%. A dust removal chamber of 5-10mm is formed between the metal filter screen and the outer wall of the rotating drum.

2. A stickiness index measuring drum dedusting device according to claim 1, characterized in that, The detachable buckle structure includes an annular groove and an elastic strip. The annular groove is located on the end face of the rotating drum disc, and the elastic strip is located on the edge of the metal filter screen. The elastic strip is L-shaped and has an interference fit with the annular groove.

3. A stickiness index measuring drum dedusting device according to claim 1, characterized in that, The rotating drum disc is a stainless steel cylinder, and a rotating drum shaft is set at the center of the bottom of the rotating drum disc to connect the driving device.

4. A stickiness index measuring drum dedusting device according to claim 1, characterized in that, It also includes an annular dust collection pipe, which is embedded on the outside of the rotating drum disc and located below the dust removal chamber. A suction pipe is installed on the annular dust collection pipe, and a pipe cover is installed on the suction pipe.

5. A drum duster for determining the stickiness index according to claim 4, characterized in that The annular dust collection port is opened on the inner side of the annular dust collection pipe, and the axis of the annular dust collection port forms a 30° angle with the center line of the dust removal chamber.

6. A stickiness index measuring drum dedusting device according to claim 1, characterized in that, It also includes a high-frequency vibrator, which is installed on the side wall of the drum shaft and contacts the bottom of the metal filter screen through a transmission rod.

7. A stickiness index measuring drum dedusting device according to claim 3, characterized in that, The driving device for the rotating drum is a variable frequency motor, and a fixed bracket is provided at the bottom of the variable frequency motor.

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